Water Excitation as an Alternative to Fat Saturation in MR Imaging: Preliminary Results in Musculoskeletal Imaging

Hauger, O.; Dumont, Éric; Chateil, Jean‐François; Moinard, M.; Diard, F

doi:10.1148/radiol.2243011227

Cited by 69 publications

(64 citation statements)

References 17 publications

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“…Because disease detection does not depend on stenosis, disease overestimation by artifactual signal loss seen with magnetic resonance angiography of flowing blood is not an issue. The use of a water excitation pulse to remove fat signal has recently been shown to be faster and to produce improved image quality in comparison with other fat-removing techniques 13 …”

Section: Strengths Of the Present Studymentioning

confidence: 99%

Characterization of Complicated Carotid Plaque With Magnetic Resonance Direct Thrombus Imaging in Patients With Cerebral Ischemia

Moody¹,

Murphy²,

Morgan³

et al. 2003

Circulation

413

308

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Background-Thromboembolic disease secondary to complicated carotid atherosclerotic plaque is a major cause of cerebral ischemia. Clinical management relies on the detection of significant (Ͼ70%) carotid stenosis. A large proportion of patients suffer irreversible cerebral ischemia as a result of lesser degrees of stenosis. Diagnostic techniques that can identify nonstenotic high-risk plaque would therefore be beneficial. High-risk plaque is defined histologically if it contains hemorrhage/thrombus. Magnetic resonance direct thrombus imaging (MRDTI) is capable of detecting methemoglobin within intraplaque hemorrhage. We assessed this as a marker of complicated plaque and compared its accuracy with histological examination of surgical endarterectomy specimens. Methods and Results-Sixty-three patients underwent successful MRDTI and endarterectomy with histological examination. Of these, 44 were histologically defined as complicated (type VI plaque). MRDTI demonstrated 3 false-positive and 7 false-negative results, giving a sensitivity and specificity of 84%, negative predictive value of 70%, and positive predictive value of 93%. The interobserver (ϭ0.75) and intraobserver (ϭ0.9) agreement for reading MRDTI scans was good. Conclusions-MRDTI of the carotid vessels in patients with cerebral ischemia is an accurate means of identifying histologically confirmed complicated plaque. The high contrast generated by short T 1 species within the plaque allows for ease of interpretation, making this technique highly applicable in the research and clinical setting for the investigation of carotid atherosclerotic disease. Key Words: thrombus Ⅲ plaque Ⅲ carotid arteries Ⅲ imaging Ⅲ cerebral ischemia A therothrombotic carotid disease is a major cause of cerebral ischemia. Embolization from the surface of an atherosclerotic plaque to cerebral vessels can result in occlusion, which, if sufficiently prolonged, will result in cerebral infarction. More transient vascular occlusion may result in temporary ischemia, producing a neurological deficit that recovers with little or no residual brain damage. Clinically, transient ischemic attacks (TIAs) provide a warning of further cerebral ischemic events; Ϸ10% of patients who sustain a TIA, left untreated, will suffer a definitive stroke in the following year, 1 followed by a rate of 5% per annum. A warning TIA therefore offers the chance to intervene to prevent future permanent cerebral damage. The North American 2 and European 3 endarterectomy trials have both shown the positive benefit of surgery in patients with significant stenosis. The trials also indicate that lesser degrees of carotid disease are responsible for a significant number of strokes, but the risks of surgery matched or outweighed the benefits. Techniques have been sought to further define those among the group with moderate stenosis who are at high risk.In 1995, Stary et al, 4 for the American Heart Association, defined different atherosclerotic subtypes, the purpose being to pathologically identify plaque more likely to ...

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Section: Strengths Of the Present Studymentioning

confidence: 99%

Characterization of Complicated Carotid Plaque With Magnetic Resonance Direct Thrombus Imaging in Patients With Cerebral Ischemia

Moody¹,

Murphy²,

Morgan³

et al. 2003

Circulation

413

308

View full text Add to dashboard Cite

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“…Meanwhile, IDEAL is compatible with essentially any pulse sequence, including fast spin echo, steady-state free precession (SSFP), and T1-weighted spoiled gradient-recalled echo (GRE). In all, IDEAL imaging provides uniform and reliable fat suppression [12,13].…”

Section: Dixonmentioning

confidence: 99%

“…1) In PROSET and WATS, two types of composite pulses can be used routinely: a four-element composite pulse with a 1:3:3:1 amplitude ratio (11.25˚:33.75˚: 33.75˚:11.25˚) and a three-element composite pulse with a 1:2:1 amplitude ratio (22.45˚:45.00˚:22.45˚). With this technique, only water is excited by using section-elective composite pulses, while lipid spins are left in equilibrium, thereby producing no signal [13]. Section-selective water excitation is faster than conventional fat saturation and produces images of better quality.…”

Section: Fat Suppression Water or Fat Selective Excitation Techniquementioning

confidence: 99%

The Application of Fat-Suppression MR Pulse Sequence in the Diagnosis of Bone-Joint Disease

Wu¹,

Lu²,

Gu³

et al. 2012

IJMPCERO

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Fat-suppression technology of magnetic resonance is very important in clinical practice. This article is written to interpret the principle, advantages/disadvantages and clinical applications of some regular fat-suppression sequences in the diagnosis of Bone-Joint Disease, including: 1) frequency-selective saturation (FS); 2) short-TI inversion recovery (STIR); 3) frequency selective inversion pulse; 4) fat suppression water or fat selective excitation technique; 5) Dixon technology and 6) magnetization transfer contrast (MTI).

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“…Short tau inversion recovery (STIR) sequences are less susceptible to metallic implants than sequences using frequencyselective fat-suppression [22]. Water excitation sequences are also superior to fat suppression, but may not be available on all scanners [23]. Increasing sampling bandwidth reduces susceptibility artifacts, but increases image blurring.…”

Section: Computed Tomographymentioning

confidence: 99%

Shoulder arthroplasty

2008

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Shoulder prostheses are now commonly used. Clinical results and patient satisfaction are usually good. The most commonly used types are humeral hemiarthroplasty, unconstrained total shoulder arthroplasty, and semiconstrained inversed shoulder prosthesis. Complications of shoulder arthroplasty depend on the prosthesis type used. The most common complications are prosthetic loosening, glenohumeral instability, periprosthetic fracture, rotator cuff tears, nerve injury, infection, and deltoid muscle dysfunction. Standard radiographs are the basis of both pre- and postoperative imaging. Skeletal scintigraphy has a rather limited role because there is overlap between postoperative changes which may persist for up to 1 year and early loosening and infection. Sonography is most commonly used postoperatively in order to demonstrate complications (hematoma and abscess formation) but may also be useful for the demonstration of rotator cuff tears occurring during follow-up. CT is useful for the demonstration of bone details both pre- and postoperatively. MR imaging is mainly used preoperatively, for instance for demonstration of rotator cuff tears.

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Water Excitation as an Alternative to Fat Saturation in MR Imaging: Preliminary Results in Musculoskeletal Imaging

Abstract: Section-selective water excitation is faster than conventional fat saturation and produces images of better quality.

Cited by 69 publications

References 17 publications

Characterization of Complicated Carotid Plaque With Magnetic Resonance Direct Thrombus Imaging in Patients With Cerebral Ischemia

Characterization of Complicated Carotid Plaque With Magnetic Resonance Direct Thrombus Imaging in Patients With Cerebral Ischemia

The Application of Fat-Suppression MR Pulse Sequence in the Diagnosis of Bone-Joint Disease

Shoulder arthroplasty

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